It "might" just be simple spark blowout as the real world loads an engine more than the dyno, I'd try dropping the gaps and see if it improves keeping in mind NOT to touch the centre electrodes as they're easily damaged.
First things first though pull a plug as see what the gaps are now.
You should be able to see it with the head on (just)
I'd be doing a Comp and a Leakdown and possibly a Napa Combustion gas test long before I'd think about pulling the head as if the block hasn't been surfaced much the rivet doesn't affect anything as the stock block casting drops away there...
You should be able to see if the rivet is at fault before you go to the effort of pulling the engine/head.
Do you have any pics of the Deck surface without the head?
I would prefer to wait and see how it behaves in use on the road and on the dyno before making it an article as I believe there will be a few issues and it may need some detail changes.
Nope that's why I did the angle cut so the weld is longer and diagonal against the load, mine was done back in 97 with no signs of cracking.
Well guess I'm just a fucking moron then that knows nothing and people should just ignore me......
No probs Dennis, probably just me being a crotchety old fuck again :: IJ. ::
The effect is real trust me on this one, guess I notice these things as I'll spend weeks working on my road tune and data log hours and hours to disect each evening, couldn't isolate this issue till I stopped for...
LOL wasn't the MoTeC but yeah that's pretty much how it went, there was going to be violence if it wasn't repaired on the spot.... :nono:
(I had exhausted my tiny supply of patience and understanding)
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